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13 P. Capiluppi - II Workshop Atlas-CMS - Napoli Ottobre 2004 ATLAS DC2 u Consider DC2 as a three-part operation: part I: production of simulated data (July-September 2004) è running on Grid è Worldwide part II: test of Tier-0 operation (November 2004) è Do in 10 days what should be done in 1 day when real data-taking start è Input is Raw Data like è output (ESD+AOD) will be distributed to Tier-1s in real time for analysis part III: test of distributed analysis on the Grid è access to event and non-event data from anywhere in the world both in organized and chaotic ways u Requests ~30 Physics channels ( 10 Millions of events) Several millions of events for calibration (single particles and physics samples)

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23 P. Capiluppi - II Workshop Atlas-CMS - Napoli Ottobre 2004 Atlas DC2 sommario u Major efforts in the past few months Redesign of the ATLAS Event Data Model and Detector Description Integration of the LCG components (G4; POOL; …) Introduction of the Production System è Interfaced with 3 Grid flavors (and legacy systems) u Delays in all activities have affected the schedule of DC2 Note that Combined Test Beam is ATLAS 1st priority And DC2 schedule was revisited è To wait for the readiness of the software and of the Production system u DC2 3 flavors coherently About 80% of the Geant4 simulation foreseen for Phase I has been completed using only Grid and using the 3 flavors coherently; The 3 Grids have been proven to be usable for a real production u BUT Phase I progressing slower than expected and all the involved elements need improvements: è Grid middleware; Production System; deployment and monitoring tools over the sites It is a key goal of the Data Challenges to identify these problems as early as possible.

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28 P. Capiluppi - II Workshop Atlas-CMS - Napoli Ottobre 2004 CMS Data Challenge 04 Processing Rate Processed about 30M events But DST errors make this pass not useful for analysis Post-DC04 3rd version ready for production in next weeks Generally kept up at T1s in CNAF, FNAL, PIC Got above 25Hz on many short occasions But only one full day above 25Hz with full system RLS, Castor, overloaded control systems, T1 Storage Elements, T1 MSS, …